N. 22: Rajendra Singh & Mamta Srivastava

G. it. Ent., 4 (22): 217-222

August 31, 1989

Length of last antennal segment as a criterion

to identify collected nymphal instars of aphids

by

RAJENDRA SINGH & MAMTA SRIVASTAVA

Abstract - The length of last antennal segment of 3 aphid species, viz., Aphis craccivora Koch., A. gossypii Glover, Lipaphis erysimi (Kalt.), nymphs and adults reared in the laboratory, were instar- as well as species-specific. The multimodal analysis of this criterion of field collected aphid populations detected five distribution peaks (4 nymphal instars and 1 adult). There was no countable overlap between successive instar distributions in all the species studied. Therefore, the length of last antennal segment proved to be a useful criterion for instar identification of the field populations of A. craccivora, A. gossypii and L. erysimi apterous virginoparae.

N. 20: Juan M. Nieto Nafría & M. Pilar Mier Durante

G. it. Ent., 4 (20): 117-122

December 31, 1988

Las ninfas de Colopha hispanica Nieto Nafría y Mier Durante, 1987

(Hom. Aphidoidea: Pemphigidae)

por

JUAN M. NIETO NAFRÍA y M. PILAR MIER DURANTE

Abstract - The nymphs of Colopha hispanica Nieto Nafría & Mier Durante, 1987 (Hom. Aphidoidea: Pemphigidae) - Colopha hispanica Nieto Nafría & Mier Durante, 1987 was described on apterous parthenogenetic females, which is the only known morph of this species. Now, the first and third instar nymphs are described. Taxonomic and biomorphological notes are given: the species is correctly placed in the genus Colopha and there are correlations between the biology and the morphological characters of the species.